In my opinion, it has nothing to do with attention span. If a song is filled with 8+ minutes of solid material, with enough depth and variation, then that’s great. On the flip side of that coin, you have most DT songs, where there is just so much blatant filler and repetition, with explosions of virtuosity just for the sake of showboating. And I could look past ALL of that if it weren't for Rudess's over-the-top, kazoo-like keyboard parts. It has always seemed to me that for all of the piss and vinegar people had for Portnoy, Rudess has been the one that holds them back the most from writing quality songs.